Do I re-jet or not?

[LocoKat]

With a new Yoshi slip on is necessary to do this? (re-jeting)
any comments... :-D

[steves]

Most slipons will be okay with stock jetting, however to get the most out of it you'll probably want to rejet.

[LocoKat]

Is that something I can do (not good with mechanics lol)?
Is expensive?

[steves]

It's not a job for a novice.

Here's a link to trinc's write up:
http://www.motorcycleanchor.com/katana/trinc/jetkit.htm

[LocoKat]

so my best shot will it be to take it to a "shop"?

[Spedee]

It's really not hard. Good directions will help. I have now done a 600 and a 750. Two different kits and no problems with either. And also both didn't require tweaking.

[BarMatt80]

if you do take it to a shop, i recommend a dyno shop with an exhaust gas analyser. no reason to pay fees to someone that thinks they can tell real air/fuel mixtures, as opposed to someone that can tell exactly what the bike is doing. i know some people keep stock jetting just have to richen up the pilots to stop deceleration popping.

[LocoKat]

So if I don't re jet I'm going to get the popping sound?

[md86]

Most likely , yeah .

[BarMatt80]

also some decel popping comes with the fact that you put a slip on or full system. sometimes you can't get ride of it completely

[LocoKat]

Any idea how much will it cost (average)?

[md86]

A jet kit ? Usually see them around $100-$120 .

[The CyberPoet]

Expect to pay $139, use www.ivansperformanceproducts.com, and if you're willing to roll to Tampa, I can help you put it in, if you're scared of doing it yourself.

Do you need it? Probably not, but you'll get a lot richer mid-range and better throttle response as a result.

Cheers,
=-= The CyberPoet

[LocoKat]

Thanks Cyber

[Jabara57]

what exactly is happening when the exhaust is popping on decel?

[md86]

It leans out so it won't ignite in the cylinder , then once enough fuel builds up in the exhaust , it ignites .

[gosman767]

If you're going to rejet it's worth the extra to get it dyno'ed and set up right IMHO